Three-month, Single-center Study to Identify Biomarkers/Response to Xolair Therapy in Chronic Idiopathic Urticaria

The patients will receive one subcutaneous injection of Xolair® (omalizumab) at a dose of 300 mg on Days 1, 30, and 60. This dose is based on the results of the international, multicenter, randomized, double-blind, placebo-controlled study which demonstrated that omalizumab significantly decreased clinical symptoms and signs of chronic idiopathic urticaria in patients who had remained symptomatic despite the use of H1-antihistamines (Maurer et al., 2013)